V. G. Kayuk

PRODUCTION, MECHANICAL AND TRIBOLOGICAL PROPERTIES OF LAYERED COMPOSITE MATERIALS BASED ON A CHROMIUM CARBIDE ALLOY

Layered materials have been produced by joining hard surface layers of chromium carbide alloys to a less expensive substrate of steel. This method provides a substantial increase in the hardness and tribological properties of the composites, economizes on the use of expensive refractory materials, and decreases manufacturing costs. Composite layered materials of chromium carbide alloys can be recommended for the production of components which in addition to frictional wear are exposed to corrosive media and high temperatures.

Structure Formation in Alloys of the Cr3C2–TiN System and the Properties of Materials Based on Them

The addition of 10-20% TiN to chromium carbide made it possible to obtain almost pore-free Cr3C2–TiN alloy specimens by hot pressing in the range from 1500 to 1850°C at a pressure of 35.7 MPa for 25 min. The 90% Cr3C2–10% TiN alloy had the maximum hardness (89 HRA) while the alloy containing 15% TiN had the maximum bending strength (480 MPa). Activation of solid-phase sintering is shown to cause a Cr3C2 solid solution to form in the titanium nitride. In alloys containing 50% or more TiN sintering is activated by the formation of a liquid phase based on the Ti–Cr–C–N eutectic.

Effect of phosphorus additions on structure formation in materials of the system Cr3C2−TiN−Ni−P

The effect of phosphorus additions on structure formation in materials of the system Cr3C2−TiN−Ni−P is studied. It is established that phosphorus additions as a surface-active element promote an improvement in nickel alloy adhesion properties.